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          【Linux】SSH的基本使用
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        <h2 id="基础"><a href="#基础" class="headerlink" title="基础"></a>基础</h2><p>在 Linux 系统上 SSH 是非常常用的工具，通过 SSH Client 我们可以连接到运行了 SSH Server 的远程机器上。SSH Client 的基本使用方法是：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ssh user@remote -p port</span><br></pre></td></tr></table></figure>
<ul>
<li>user 是你在远程机器上的用户名，如果不指定的话默认为当前用户  </li>
<li>remote 是远程机器的地址，可以是 IP，域名，或者是后面会提到的别名  </li>
<li>port 是 SSH Server 监听的端口，如果不指定的话就为默认值 22 </li>
</ul>
<p>在执行了 ssh 命令之后，远程机器会询问你的密码。在输入密码的时候，屏幕上不会显示明文密码，也不会显示 <strong>**</strong>，这样别人就不会看到你的密码长度了，按下回车即可登入。</p>
<p>登入之后，就可以远程控制机器啦！</p>
<h2 id="安装OpenSSH-Server"><a href="#安装OpenSSH-Server" class="headerlink" title="安装OpenSSH Server"></a>安装OpenSSH Server</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">local$ ssh user@remote -p port </span><br><span class="line">ssh: connect to host remote port 22: Connection refused</span><br></pre></td></tr></table></figure>
<p>如果你遇到了上面的消息，说明在远程机器上没有安装 SSH Server，特别地，如果远程机器运行的是 Ubuntu Desktop 系统，那么默认是没有安装 SSH Server 的。这个时候，你可以联系管理员让他安装 SSH Server，或者如果你有 sudo 权限的话，可以执行下面命令安装：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo apt install openssh-server</span><br></pre></td></tr></table></figure>
<p>相应的本地机器需要执行下面的命令：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sudo apt install openssh-client</span><br></pre></td></tr></table></figure>
<h2 id="免密码登入"><a href="#免密码登入" class="headerlink" title="免密码登入"></a>免密码登入</h2><p>在本地机器输入下面指令生成 SSH 钥匙，一路回车即可。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ssh-keygen</span><br></pre></td></tr></table></figure>
<p>输出的内容告诉了我们，生成的公钥放在了 ~/.ssh/id_rsa.pub，私钥放在了 ~/.ssh/id_rsa。接下来，我们要让远程机器记住我们的公钥。最简单的方法是</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ssh-copy-id user@remote -p port</span><br></pre></td></tr></table></figure>

<h2 id="配置别名"><a href="#配置别名" class="headerlink" title="配置别名"></a>配置别名</h2><p>每次都输入 ssh user@remote -p port，时间久了也会觉得很麻烦，特别是当 user, remote 和 port 都得输入，而且还不好记忆的时候。配置别名可以让我们进一步偷懒。</p>
<p>比如我想用 ssh lab 来替代上面这么一长串，那么在 ~/.ssh/config 里面追加以下内容：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">Host lab</span><br><span class="line">    HostName remote</span><br><span class="line">    User user</span><br><span class="line">    Port port</span><br></pre></td></tr></table></figure>
<p>保存之后，即可用 ssh lab 登入，如果还配置了公钥登入，那就连密码都不用输入了。</p>
<h2 id="传输文件"><a href="#传输文件" class="headerlink" title="传输文件"></a>传输文件</h2><p>在两台机之间传输文件可以用 scp，它的地址格式与 ssh 基本相同，都是可以省略用户名和端口，稍微的差别在与指定端口时用的是大写的 -P 而不是小写的。不过，如果你已经配置了别名，那么这都不重要，因为 scp 也支持直接用别名。scp 用起来很简单，看看下面的例子就明白了：</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"># 把本地的 &#x2F;path&#x2F;to&#x2F;local&#x2F;file 文件传输到远程的 &#x2F;path&#x2F;to&#x2F;remote&#x2F;file</span><br><span class="line">scp -P port &#x2F;path&#x2F;to&#x2F;local&#x2F;file user@remote:&#x2F;path&#x2F;to&#x2F;remote&#x2F;file</span><br><span class="line"></span><br><span class="line"># 也可以使用别名</span><br><span class="line">scp &#x2F;path&#x2F;to&#x2F;local&#x2F;file lab:&#x2F;path&#x2F;to&#x2F;remote&#x2F;file</span><br><span class="line"></span><br><span class="line"># 把远程的 &#x2F;path&#x2F;to&#x2F;remote&#x2F;file 下载到本地的 &#x2F;path&#x2F;to&#x2F;local&#x2F;file</span><br><span class="line">scp lab:&#x2F;path&#x2F;to&#x2F;remote&#x2F;file &#x2F;path&#x2F;to&#x2F;local&#x2F;file</span><br><span class="line"></span><br><span class="line"># 远程的默认路径是家目录</span><br><span class="line"># 下面命令把当前目录下的 file 传到远程的 ~&#x2F;dir&#x2F;file</span><br><span class="line">scp file lab:dir&#x2F;file</span><br><span class="line"></span><br><span class="line"># 加上 -r 命令可以传送文件夹</span><br><span class="line"># 下面命令可以把当前目录下的 dir 文件夹传到远程的家目录下</span><br><span class="line">scp -r dir lab:</span><br><span class="line"></span><br><span class="line"># 别忘了 . 可以用来指代当前目录</span><br><span class="line"># 下面命令可以把远程的 ~&#x2F;dir 目录下载到当前目录里面</span><br><span class="line">scp -r lab:dir&#x2F; .</span><br></pre></td></tr></table></figure>

<h2 id="保持程序在后台运行"><a href="#保持程序在后台运行" class="headerlink" title="保持程序在后台运行"></a>保持程序在后台运行</h2><p>有时候你想要在远程的机器上跑一个需要长时间运行的程序，比如一些计算，然后当你睡了一觉再登入远程的机子上却发现什么结果都没有。这是因为一旦 ssh 进程退出，所有它之前启动的程序都会被杀死。那么有什么办法可以保持程序在后台运行呢？</p>
<p>你需要在远程的机子上使用 tmux。tmux 是一个会话管理程序，他会保持程序一直运行着。在 Ubuntu 上你可以通过 sudo apt-get install tmux 来安装。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">remote$ tmux</span><br></pre></td></tr></table></figure>
<p>这样你就进入到了 tmux 管理的会话中，之后你再运行任何东西都不会因为你退出 ssh 而被杀死。要暂时离开这个会话，可以先按下 ctrl+b 再按下 d。要恢复之前的会话，只需要执行</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">remote$ tmux attach</span><br></pre></td></tr></table></figure>
<p>tmux 还能管理多个窗口、水平竖直切分、复制粘贴等等，你可以看看<a href="https://link.zhihu.com/?target=http://blog.jobbole.com/87584/">这篇不错的文章</a>来入门。</p>
<p>如果你是Mac用户，那么十分幸运的是，你几乎不需要任何学习，只要把你的终端由系统自带的 Terminal 换成 iTerm 2。iTerm 2 自带超好的 tmux 支持，你可以像操作本机的标签页一样操作 tmux 会话。你只需要在新建会话的时候使用 tmux -CC，在恢复的时候使用 tmux -CC attach 即可。具体的可以参见 iTerm2 and tmux Integration。</p>
<p>最后强调一遍，tmux 应该运行在远程的机子上，而不是本机上，否则程序在 ssh 退出时依然会被杀死。</p>
<blockquote>
<p>本文参考：<a target="_blank" rel="noopener" href="https://zhuanlan.zhihu.com/p/21999778">SSH 基本用法</a> </p>
</blockquote>

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